Re-Sync Times for DFS and DAG

All users based at HQ connect to a File Server and the Primary Exchange Server (all Databases mounted here)

They have a passive DFS server and and passive Exchange Server with copies of the databases, and the 2 sites are connected via a VPN.

DFS is configured with over-ride referral on each namespace which dictates that all users will connect to the HQ machine regardless of which site they are at, until such time as the Primary DFS Server goes down.

My main concern is if they have a site down scenario and the primary servers are OFF for an extended period:

1. Will DFS get itself in a muddle as users will immediately connect back to the primary server which has not yet received the replicated changed files

2. How does DAG deal with the same situation? If the main server comes back up, will the database copies automatically revert the the lowest preference server (primary) and if so, then how does it handle missing files/emails while it updates?

I can answer DAG section here. If secondary site doesn't have any users and it is just for DR purpose, and if your primary site is going down for a longer window. In that case, first make sure DAC mode

I can answer DAG section here. If secondary site doesn't have any users and it is just for DR purpose, and if your primary site is going down for a longer window. In that case, first make sure DAC mode is enabled. Next you need to perform manual switch over to DR site. More to read herehttp://msexchangeguru.com/2012/10/25/exchange-2010-dag-dr/

ADCs have gained traction within the last decade, largely due to increased demand for legacy load balancing appliances to handle more advanced application delivery requirements and improve application performance.

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